使用JPanel进行swing Java组件部署

1 周，5 日 Questions & Answers 135

我希望组件部署如下图所示：

我编写了一段代码，在JFrame中生成两个JPanel，并将组件JPanel放在左侧。我将框架布局设置为BorderLayout，将每个面板的布局设置为FlowLayout。然而，结果并不是我想要的。即使列表不显示

结果图片：

你能告诉我怎么办吗

下面有一个代码

package com.java.APISearch; import java.awt.*; import javax.swing.*; import javax.swing.JPanel; public class MainFrame extends JFrame { JPanel search; JPanel result; JLabel ksLb; JTextField ksTf; JButton ksOK; JCheckBox choicePackage; JCheckBox choiceClass; JCheckBox choiceFunc; JTextField dsTf; JButton dsOK; JLabel rcLb; JList<String> rcList; JTextField resultTf; Container contentPane; public MainFrame(String title) { super(title); Toolkit tk = Toolkit.getDefaultToolkit(); Dimension screenSize = tk.getScreenSize(); setLocation(screenSize.width/2 - 300, screenSize.height/2 - 200); setSize(new Dimension(600, 400)); setResizable(false); setLayout(new BorderLayout()); search = new JPanel(); result = new JPanel(); search.setLayout(new FlowLayout(FlowLayout.LEFT)); search.setSize(new Dimension(300,400)); result.setLayout(new FlowLayout()); result.setSize(new Dimension(300,400)); contentPane = getContentPane(); contentPane.add(search, BorderLayout.WEST); contentPane.add(result, BorderLayout.EAST); ksLb = new JLabel("키워드 검색"); ksTf = new JTextField(20); ksOK = new JButton("검색"); search.add(ksLb); search.add(ksTf); search.add(ksOK); choicePackage = new JCheckBox("package"); choiceClass = new JCheckBox("class"); choiceFunc = new JCheckBox("function"); dsTf = new JTextField(20); dsOK = new JButton("검색"); search.add(choicePackage); search.add(choiceClass); search.add(choiceFunc); search.add(dsTf); search.add(dsOK); rcLb = new JLabel("recent search"); rcList = new JList<String>(); search.add(rcLb); search.add(rcList); } }

# 1 楼答案

解决复杂计算任务的常用策略是将它们分解为小的、定义良好的可管理任务。分而治之
这也适用于gui：将设计分解为小的、易于布局的容器
例如，在这种情况下，首先将设计分为两个区域：

Serach面板添加到JFrame的NORTH，主面板添加到JFrame的CENTER。主面板是所有其他gui组件的容器。查看代码中的更多信息
下面是一个框架来演示该策略。请注意以下评论：

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class MainFrame extends JFrame {

    public MainFrame(String title) {
        super(title);
        setSize(new Dimension(600, 400));
        setResizable(false);
        //setLayout(new BorderLayout());// no need. its the default for JFrame
        JPanel search = new JPanel();
        search.setLayout(new FlowLayout(FlowLayout.LEFT));
        //search.setSize(new Dimension(300,400)); //let layout manager set size
                                                  //set preferred size if needed
        JLabel ksLb = new JLabel("Search:");
        JTextField ksTf = new JTextField(20);
        JButton ksOK = new JButton("Click Me");
        search.add(ksLb);
        search.add(ksTf);
        search.add(ksOK);
        add(search, BorderLayout.NORTH); //add search to content pane

        //construct a container to hold all the rest
        //set border layout to it
        JPanel mainPanel = new JPanel(new BorderLayout());
        //add content to mainPanel:
        //add result to NORTH 
        //add a JPanel to hold list and label to CENTER 
        add(mainPanel, BorderLayout.CENTER);//main to content pane
        setVisible(true);
    }
}

更多应用此策略的示例：1 2和3

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使用JPanel进行swing Java组件部署

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